Improvement in optical instruments



Li HEATH.y Optical Instrument.

No; V54,542.

Patented May. a, 1866.4`

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'Nrrnn STATES PATENT OFFICE.

LABAN HEATH, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN OPTICAL INSTRUMENTS.

Specification forming part of Letters Patent No. 54,542, dated May S, 1866; antedated IIIay l, 1866.

To all whom it may concern:

Beit known that I, LABAN HEATH, ot the city of Boston, in the county of Suffolk and State of Massachusetts, haveinvcnted a new and useful Optical Instrument Easily Convertible into a Microscope, a Telescope, and a Magnifying-Eyeglass; and I do hereby declare that the following is a full and exact description thereof, reference being` had to the accompanying drawings, and to the letters ot reference marked thereon.

Figure l is a sectional view of the instrument when adjusted to be used as a microscope. Fig. 2 is a sectional view of the samel adjusted to be used as a telescope. Fig. 3 is a perspective view of that part which, being detached, serves as a magndying-eyeglass.

Like letters refer tothe same parts in all the iigures.

A is that portion ot' the microscope containing the two large double convex lenses a and a', and which, being detached, constitutes a magnitfying'eyeglass of great power. B and B' are two ordinary telescope-tnbes, one sliding within the other in the ordinary way,

and bis a plano-convex lens or the ordinary larger lens ot' a telescope. C is a cap screwed onto the end ofthe sliding tube B', containing an achromatic lens, c. When these parts are all put together and arranged as shown in Fig. 1A the instrument is a microscope of great magnifying power.

To convert the instrument into a telescope,

the part A, containing the two double convex lenses, is detached, and the screw-cap C', containing the concave lens c', is substituted for the screw-cap C, as shown in Fig. 2. The part A being thus detached becomes a convenient 1nagnifying-eyeglass. Said partA is attached to the annular iiange d at the end of the tube B by means ot' pins and slots, so as tobe easily detachable, .or by other known devices for similar purposes.

The part A is provided with adjustable feet fff, which may be turned up out of the way, or may be attached to a sliding band, so as to be drawn up out of the Way when said part 4A is not in use as an eyeglass.

Having thus fully described my invention and the various modes of carrying it into ei'- t'ect, what I claim as my invention, and desire to secure'by Letters Patent, is l As a new article of manufacture, the convertible optica-l instrument herein described, constructed, arranged, and operating substantially as set forth.

LABAN HEATH.

Witnesses:

J. J. GooMBs, JOHN OooN. 

